Dc-4 didn't waste any time getting the gear up on take off, I'm sure one of them had pulled it up before the gear left the ground and was relying on the micro switches. The video answered one question that was asked here a while ago regarding altimeter settings in Oz, Mascot tower at 17;00 used inches when the DC-3 was doing an engine out, hold over from war time I'd guess when the USAAC would have had influence on operations.
Anyone any idea the altitudes QF flew the Constellation at, seemed fairly low on the video, I believe they didn't use the aircrafts altitude capability in order to take it easy on the engines.